公开(公告)号：US4845433A

公开(公告)日：1989-07-04

申请号：US616325

申请日：1984-05-31

申请人： Robert L. Kleinberg ,  Donald G. Dudley ,  Weng C. Chew ,  Brian Clark

发明人： Robert L. Kleinberg ,  Donald G. Dudley ,  Weng C. Chew ,  Brian Clark

IPC分类号： G01V3/28

CPC分类号： G01V3/28

摘要： A wall-engaging apparatus for microinductively investigating a characteristic of earth formations traversed by a borehole includes an antenna set mounted in a longitudinally elongated body adapted for a sliding engagement with the wall of the borehole. The antenna set includes a conductive backplane member mounted in the body parallel to the wall-engaging face of the body and first, second, and third half-loop antenna elements. The half-loop antenna elements are coaxial located symmetrically about the half-loop of the first antenna element, with their respective ends located at the backplane member to couple image currents in the backplane. The locations of the second and third antenna elements are further selected to place the second and third antenna elements in electromagnetic symmetry relative to the first antenna element. A differential coupler is included for coupling the second and third antenna elements.

摘要翻译： 用于微观地研究由钻孔穿过的地层的特征的壁接合装置包括安装在纵向细长的主体中的天线组，其适于与钻孔的壁滑动接合。 天线组包括安装在主体中平行于主体的壁接合面的导电底板部件和第一，第二和第三半环天线元件。 半环形天线元件围绕第一天线元件的半环对称地同轴定位，并且它们各自的端部位于背板构件以耦合背板中的图像电流。 进一步选择第二和第三天线元件的位置以使第二和第三天线元件相对于第一天线元件电磁对称。 包括差分耦合器用于耦合第二和第三天线元件。